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RAID Scrub broken in 6.9.2?
Is anyone else having issues with RAID scrub seeming to go much slower and seemingly quit part of the way through with 6.9.2? 4-drive RAID5 here. I've started two scrubs now, they go even slower than usual, appearing to go even slower than they used to, and they don't report ever being finished in the log. No errors, no completion message.
From my volume.log:
data scrub 2018-01-20 02:00:01 2018-01-20 13:52:01 pass data scrub 2018-01-27 02:00:01 data scrub 2018-01-27 16:45:02
You can see the first scrub on the list working normally under 6.9.0, then two mysteriously not finishing scrubs under 6.9.2. Netgear folks, is this a bug? FWIW, we have never used the antivirus feature.
The scrub happily finished this time. Go figure.
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Update, scrub is reporting done at the command line but some sort of resync is still occurring by looking at top (md127_resync and md127_raid5 each taking up a CPU core). Frontview is saying scrub is still only 20% done. Going to see if the scrub job mysteriously disappears again from frontview. Thinking there might be some sort of frontview bug in 6.9.2.
root@[hostname scrubbed]:/var/log# btrfs scrub status /data scrub status for d087569e-efd2-4262-bcf5-a2689bb38849 scrub started at Sun Jan 28 12:31:25 2018 and finished after 04:25:55 total bytes scrubbed: 4.54TiB with 0 errorsThe GUI-initiated scrub performs both an mdadm (the software RAID) re-sync and a btrfs (the file system) scrub. The GUI shows thes both as a "scrub". Use cat /proc/mdstat to see if one of the volumes is still re-syncing or stuck trying to do so.
This is not new in 6.9.2, BTW.
It would be worth checking smart_history.log for recent changes in key SMART values.
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